Malicious PDF — malware analysis report

Static analysis result for SHA-256 99664caef4a23230…

MALICIOUS

PDF

40.6 KB Created: 2020-08-23 17:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 936e906c5518652049d5a0cee4593ee5 SHA-1: f4fcf7e70da9362a9794cf4f991223f9171276df SHA-256: 99664caef4a23230e7ba3d42ee1902f3af77f21b61296139ee02a0ce9348538a
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The embedded URL and the document body text both point to a lure related to '1st grade worksheets free printables'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content. The presence of numerous Shopify links suggests an attempt to blend malicious links with seemingly benign ones.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=1st+grade+worksheets+free+printables In PDF document text
    • http://files.babybegreendiaperservice.com/uploads/1/3/0/8/130873820/vurajopefupal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/79663717079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2654/4797/files/atkins_induction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7479/8247/files/98319078564.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/tikomotovenegekowixobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/simple_decision_making_matrix_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9131/9200/files/25532150084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1731/2168/files/sufozosukulupuxomowotur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8948/4189/files/vixilapemovamono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/65711543684.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/begej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/bharat_nu_bandharan_book_2020.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAB 5556 bytes
SHA-256: b31bf8026d25812dfab84c097156d5ac66a5fb676bb4196580afea5d690f2581
font_01_sfnt_off00006e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9C 11604 bytes
SHA-256: 54648d45b4f2f13c4a52085363b0c37f219ed6cf032e50c00d810fc067188b29

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